William craig



UNITED STATES PATENT OFFICE.

WILLIAM CRAIG, OF NEW YORK, N. Y.

OSCILLATING ENGINE.

Specification of Letters Patent No. 11,664, dated September 12, 1854.

To all whom t may concern:

Be it known that I, VVILLIAMCRAIG, of the city, county, and State of New York, have invented certain new and useful Improvenients in` Oscillating Steam-Engines; and I do her-eby declare the following to be a full and clear description of the same.

The nature of my invention co-nsists in the construction and arrangement of the steam chambers outside of the bearings or trunnion on which the cylinder oscillates;

l that is to say, I make the steam pipe act in the capacity of both steam pipe, and steam chamber' and valves, and by means of an eccentric rod, working from an eccentric on the main shaft, cause the steam chamber and valvesto work in the reverse way to the motion of the cylinder, thereby giving the valves a double action. But to describe my invention more particularly I will refer to the accompanying drawings forming a part of this schedule the same letters of reference wherever they occur referring to the same parts.

Figure l, is a longitudinal elevation of the engine, showing the steam pipe or valve with eccentric hook attached. Fig. 2, is an end elevation of the engine, showing the trunnion with the apertures. Fig. 3, is a view of the face of the valve or steam pipe. Fig. Ll-, is a longitudinal cut section of the valve or steam pipe or chamber.

Letter I), is the steam pipe or valve working on the face of the trunnion and kept in its place by means of a follower F, screwed to the trunnion, by a screw cut on the trunnion or otherwise as may be most convenient for making a steam tight joint. The opposite end of the steam pipe or valve, is attached to the steam pipe leading from the boiler to the cylinder, by means of a stufiing box B, or any other suitable device so as to allow the steam pipe or valve to work freely and at the same time preserve the connection between the boiler and cylinder, i

Letters S, S, are the steam ports communicating with the cylinder above and below the piston, by means of steam passage ways A, A, in-the usual way employed in oscillating steam engines.

Letters T, T, are the exhaust ports, leading to a condenser, by means of a belt G, round the cylinder to the opposite trunnion.

Letters S2, S2, are the steam ports in the steam pipe or valve, and T2, T2, are the exhaust chambers, or recesses that is coned out spaces so as to allow the exhaust steam to escape more freely. To increase the area of the steam and exhaust ports, I give the ecL centric more throw than the oscillating motion of the cylinder, by this means I am enabled to regulate and control the cutoff in any way that I desire.

Letter R, represents the eccentric rod for operating the steam pipe or valves.

Having now described my invention I will proceed to state what I claim and desire to secure by Letters Patentof the United States.

What I claim is- The steam pipe or valve P, oaerated by means of the eccentric rod for o taining a double action, in combinationwith the follower F, and trunnion of an oscillating steam engine, for the purpose of admitting steam into the face of the trunnion without regard to size of ports, substantially in mode of construction of the said ports, and application thereof as hereinbefore described.

2. I also claim as my invention the mode of arranging the eduction and induction ports without regard to size, substantially as hereinbefore set forth.

WILLIAM CRAIG.

Witnesses:

FRANCIS W. I-IAwEs, ANTHONY H. ADAMsoN. 

